11551901 has 4 divisors (see below), whose sum is σ = 11572704. Its totient is φ = 11531100.

The previous prime is 11551879. The next prime is 11551909. The reversal of 11551901 is 10915511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10915511 = 1021 ⋅10691.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11551901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9545 + ... + 10686.

It is an arithmetic number, because the mean of its divisors is an integer number (2893176).

Almost surely, 2^11551901 is an apocalyptic number.

It is an amenable number.

11551901 is a deficient number, since it is larger than the sum of its proper divisors (20803).

11551901 is an equidigital number, since it uses as much as digits as its factorization.

11551901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20802.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 11551901 is about 3398.8087619047. The cubic root of 11551901 is about 226.0569269496.

The spelling of 11551901 in words is "eleven million, five hundred fifty-one thousand, nine hundred one".